connect Droid 3 motorola surfboard SBG6580

I am unable to connect a Droid 3 phone to my wifi network. I have Motorola surfboard SBG6580 router.

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My droid 3 connects without any issues however, my wife has the very same droid 3 phone and when I try connecting her phone, it just keeps cycling back and forth between "connecting" and "disconnecting" but the phone never connects to the network!

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I've entered the password over and over again! Tried resetting the phone by taking the battery out ... Nothing seems to work!

Yes, you were correct! I had not enabled the MAC address (thank you) ... However, after receiving your tip, I did enable the MAC address and I still get the same results. The phone cycles ... "Scanning, Connecting, Disconnected ... " and if will not connect to the network! :crying:
Any other idea???